diff --git a/src/codex/inject.ts b/src/codex/inject.ts
index 0e5304a64..73af9f431 100644
--- a/src/codex/inject.ts
+++ b/src/codex/inject.ts
@@ -1194,7 +1194,10 @@ export async function restoreNativeCodexAsync(): Promise<{
   success: boolean;
   message: string;
 }> {
-  const inline = restoreNativeCodex({ skipHistory: true });
+  const inline = restoreNativeCodexCore({ skipHistory: true });
+  if (!inline.restoreHistory) {
+    return { success: inline.success, message: inline.message };
+  }
   const outcome = await runCodexHistoryJob({
     ...resolveCodexHistoryJobTarget(),
     operation: deriveCodexHistoryOperation({
@@ -1217,9 +1220,10 @@ export async function restoreNativeCodexAsync(): Promise<{
   return { success: inline.success, message: `${inline.message}${historyMsg}` };
 }
 
-export function restoreNativeCodex(options: { skipHistory?: boolean } = {}): {
+function restoreNativeCodexCore(options: { skipHistory?: boolean } = {}): {
   success: boolean;
   message: string;
+  restoreHistory: boolean;
 } {
   const activeProvider = currentExternalCodexModelProvider();
   if (activeProvider) {
@@ -1227,6 +1231,7 @@ export function restoreNativeCodex(options: { skipHistory?: boolean } = {}): {
     return {
       success: true,
       message: `External Codex provider ${tomlString(activeProvider)} preserved; no native restore was needed.`,
+      restoreHistory: false,
     };
   }
   const journal = restoreJournalState();
@@ -1272,7 +1277,15 @@ export function restoreNativeCodex(options: { skipHistory?: boolean } = {}): {
       : history.ejectedRows
         ? ` ${history.ejectedRows} opencodex history thread(s) were ejected to openai so native Codex can resume them.`
         : "";
-  return { success: cfg.success, message: `${msg}${historyMsg}` };
+  return { success: cfg.success, message: `${msg}${historyMsg}`, restoreHistory: true };
+}
+
+export function restoreNativeCodex(options: { skipHistory?: boolean } = {}): {
+  success: boolean;
+  message: string;
+} {
+  const result = restoreNativeCodexCore(options);
+  return { success: result.success, message: result.message };
 }
 
 export function getCodexConfigPath(): string {
diff --git a/tests/codex-history-job.test.ts b/tests/codex-history-job.test.ts
index 0c9846198..8fb3a3f24 100644
--- a/tests/codex-history-job.test.ts
+++ b/tests/codex-history-job.test.ts
@@ -147,7 +147,7 @@ test("an overrun Worker returns a typed timeout rather than hanging", async () =
  */
 test("the synchronous restore body is gated on skipHistory", () => {
   const source = readFileSync(join(import.meta.dir, "..", "src", "codex", "inject.ts"), "utf8");
-  const body = source.slice(source.indexOf("export function restoreNativeCodex("));
+  const body = source.slice(source.indexOf("function restoreNativeCodexCore("));
   const historyCall = body.indexOf("syncCodexHistoryProvider(\"openai\"");
   expect(historyCall).toBeGreaterThan(-1);
 
@@ -157,5 +157,5 @@ test("the synchronous restore body is gated on skipHistory", () => {
   expect(gate).toBeLessThan(historyCall);
 
   // And the async wrapper is the thing that sets it.
-  expect(source).toContain("restoreNativeCodex({ skipHistory: true })");
+  expect(source).toContain("restoreNativeCodexCore({ skipHistory: true })");
 });
diff --git a/tests/codex-inject-integration.test.ts b/tests/codex-inject-integration.test.ts
index 0b73f1e26..7e45e080c 100644
--- a/tests/codex-inject-integration.test.ts
+++ b/tests/codex-inject-integration.test.ts
@@ -42,6 +42,19 @@ function runRestore(codexHome: string, ocxHome: string): { stdout: string; statu
   return { stdout: result.stdout?.trim() ?? "", status: result.status ?? 1 };
 }
 
+function runRestoreAsync(codexHome: string, ocxHome: string): { stdout: string; status: number } {
+  const script = `
+    const { restoreNativeCodexAsync } = require("./src/codex/inject");
+    restoreNativeCodexAsync().then(result => console.log(JSON.stringify(result)));
+  `;
+  const result = spawnSync(process.execPath, ["--eval", script], {
+    cwd: repoRoot,
+    env: { ...process.env, CODEX_HOME: codexHome, OPENCODEX_HOME: ocxHome },
+    encoding: "utf8",
+  });
+  return { stdout: result.stdout?.trim() ?? "", status: result.status ?? 1 };
+}
+
 describe("injectCodexConfig integration (Design B)", () => {
   let codexHome: string;
   let ocxHome: string;
@@ -505,6 +518,35 @@ describe("injectCodexConfig integration (Design B)", () => {
     expect(existsSync(journalPath)).toBe(false);
   });
 
+  test("async restore preserves external provider history", () => {
+    const configPath = join(codexHome, "config.toml");
+    writeFileSync(configPath, 'model_provider = "custom"\n', "utf8");
+    const rolloutPath = join(codexHome, "rollout-custom.jsonl");
+    const rollout = `${JSON.stringify({
+      type: "session_meta",
+      payload: { id: "thread-custom", model_provider: "opencodex", source: "cli" },
+    })}\n`;
+    writeFileSync(rolloutPath, rollout, "utf8");
+    const dbPath = join(codexHome, "state_5.sqlite");
+    const db = new Database(dbPath);
+    db.run(`CREATE TABLE threads (
+      id TEXT PRIMARY KEY, rollout_path TEXT NOT NULL, model_provider TEXT NOT NULL,
+      source TEXT NOT NULL, first_user_message TEXT NOT NULL, has_user_event INTEGER NOT NULL
+    )`);
+    db.run(`INSERT INTO threads VALUES ('thread-custom', ?, 'opencodex', 'cli', 'hello', 1)`, rolloutPath);
+    db.close();
+
+    const result = runRestoreAsync(codexHome, ocxHome);
+
+    expect(result.status).toBe(0);
+    expect(JSON.parse(result.stdout).message).toContain('External Codex provider "custom" preserved');
+    const restored = new Database(dbPath, { readonly: true });
+    expect(restored.query("SELECT model_provider FROM threads WHERE id = 'thread-custom'").get())
+      .toEqual({ model_provider: "opencodex" });
+    restored.close();
+    expect(readFileSync(rolloutPath, "utf8")).toBe(rollout);
+  });
+
   test("provider selected through a legacy root profile is also preserved", () => {
     const original = [
       'profile = "work"',